Grinding-machine.



B. DAVIS & G. B. ROSS. GRINDING MACHINE.

APPLICATION PILEDAUG. 27, 190B.

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Patented Aug.

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B. H; DAVIS a c. B. ROSS. GRINDING MAGHINE.

I APPLICATION FILED AUG. 27, 1903. v 932,603 Patented Aug. 31, 1909.

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B. H. DAVIS 81'. .G. B. ROSS.

GRINDING MACHINE.

APPLICATION FILED AUG. 2?, 190a.

Patented Aug. 31, 1909.

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B. H.- DAVIS & c. B. ROSS.

GRINDING MACHINE. APPLIOATION FILED AUG. 27, 1908.

932,603. Patented Aug. 31, 1909. 5 SHEETS-SHEET 4.

B. H. DAVIS & 0 Bflno ss.

GRINDING MACHINE. APPLICATION FILED AUG. 27, 1908.

Patented Aug. 31. 1909.

5 SHEETS-SHEET 5.

Chit/(170,512 0a a.

BENJAMIN H. DAVIS AND CALVIN B. ROSS,

EMERY WHEEL GOMPANY SPRINGFIELD,

0F SPRINGFIELD, OHIO, ASSIGNOBS TO THE SAFETY OHIO, A CORPORATION OF OHIO.

GRINDING AcHmE.

. to the accompanying drawings.

This invention relates to grinding nia- .chines and is designed more particularly for grinding, polishing andsharpening plow or harrow disks, colters, seed disk drills and similar work, whether the work be fiat, concave or convex.

Theobjcct of the invention is to provide a machine of this character in which the grinding member or wheel will be supported from a base mounted on the floor and will be movable in both a horizontal plane and a Vertical plane and will also be movable about a horizontal axis extending transversely to the axis of its rotation; to provide a movable work support that will support the work in position to be operated upon by the grinding member and to move the work while it is being so operated upon; to provide means for automatically starting or stopping the movable work-support when the grinding member is moved toward or away from the worksupport; to provide means whereby the work may be readily secured to and removed from thework-support; and to "rovide a machine of such a construction am to so arrange the parts thereof as to form a compact and easily operated machine which will be simple in its construction and operation, having no complicated mechanism or delicate adjustments which are liable to become disarranged or broken.

With those objects in view consists in, certain novel features and in certain" combinations and arrangements of parts to be hereinafter described, and then more particularly pointed out in the claims. In the accompanying drawings, Figure l is a side elevation of a machineembodying our invention; Fig. 2 is a top plan view of the same; Fig. 3 is alront elevation thereof, partly in section; Fig. 4 is a rearclcvation thereof; Fig. 5 is a top plan view of the worksupport showing the work in position thereon; Fig. 6 is a transverse sectional view, taken on the line 1-. :tol' Fig. 5; Fig. 7 is a view similar to Fig. (5, showing a'slightly our invention,

Specification of'Letters Patent. Application filed August 2'7, 1908. Serial No. 450,430.

l l a, l I

the yoke 15 and the supporting frame,

Patented Au 31, icon.

I modified formof fastening means; Fig. 8 is H. DAVIS i a top plan view of the work-support with the work in position thereon; Fig. 1) is a vertical sectional view, taken on the line 3 y of Fig. 8; Fig. 10 is a detailview of a modified form of fastening device; and Fig. 11 is a transverse sectional view, taken on the line 2 2 of Fig. 3 and looking in the direction of the arrows.

In these drawings, we have illustrated the preferred form of, our -machineand have shown the same as comprising a base or main frame 1' and a worlosuppoi t supported near the base 1 and preferably mounted on a housing 3 forming one end of the'base. The base is also provided with a vertically arranged bearing 4 which is preferably arranged at the end thereof opposite the housing 3 carrying the work-support. A vertically arranged bifurcated member or yoke 5" is journaled in the bearing 4 and preferably comprises an upper portion or yoke having a hollow lower portion, in v. hich is rigidly mounted a hollow spindle 6 secured therein by means of a set screw 7 and extending through the bearing 4 to a point beneath the same, here it is provided vcitha collar 8 adapted to retain the same against vertical movement relatively to the bearing. The upper ends of the arms 9 of the bifurcated portion or yoke 5 are provided with bearings 10 in which isjournaled a shaft 11 having mounted thereon a pulley 12 adapted to be connected, by means of a suitable belt with a countershaft, preferably arranged above the machine. A. second pulley, 13, is also 90 mounted. on the shaft ll. and is adapted to drive the grinding member or wheel, as it ill be hereinafter described. Each of the arms 9 of the yoke 5 is provided with a forwardly extending pivot lug 14, to which are connected the adjacent ends of the arms of a horizontal yoke '15 forming: part of a xvheclsupporting frame, indicated as a "whole by the reference numeral 16. The arms of the yoke 1.5 are connected to the lugs M by means of horizontal pivots, thusenablingof which it forms a part, to be moved through a vertical plane. The yoke 15 is provided at its for-hard end with a split bearing 17 provided with lugs 18 adapted to receive bolts 19, by means of which the bearing may be tightened orloosened about. a bar 20, preferably circular in cross section and having one end mounted in the bearing 17. A colinforce the same.

lar 21 is adjustably mounted on the bar 20 to limit the longitudinal movement of the bar relatively to the bearing 17 and this bar may be held against rotary movement relatively to the bearing 17 or may be permitted to rotate therein by tightening or loosening the bolts 19; The forward end of the bar 20 is rigidly secured to a horizontal wheel-supporting yoke 22, both arms of which are provided with bearings 23 in which is journaled a shaft 24 having one end extending beyond the adjacent arm of the yoke, as shownlat 25.

As"will be seen from Figs. 2 and 4 of the drawings, the yokes and are of such a construction that the wheel-supporting yoke 22 is located at one side of the work-support 2 and in such a position that the portion 25 of the shaft 24 which extends beyond the adjacent arm of theyoke will lie immediately above the work-support. enfi of the shaft is provided with suitable -means for securin' a grinding member thereto, such as c amping plates 26. A driving pulley 27 is mounted on the shaft 24 between the arms of the yoke 22 and is connected with the pulley 13 on the shaft 1] by means of a suitable belt 28. A vertically arranged yoke or arch 29 is rigidly secured to the arms of the yoke 22 and serves to re- A cable 30 is secured to the yoke 29 and extends upwardly, about suitable uides supported above the machine an is connected at its opposite end to acounteiweight'i-il which supports the as to intercept the dust and particles of matter thrown ofl by the grinding wheel.

As stated, the work-support 2 is mounted on the housing 3, forming part of the base,

immediately beneath the grinding member. The construction'of this work-support and the manner of mounting the same is such as to provide a very compact and a very eflieient machine, the driving mechanism and its cooperating parts being so arranged as to be entirely out of the way of the operator both while he is operating the machine and While-he is handling the work to and from the work-support. To this end, we have provided the housing 3 at its u per and lower ends with bearings 34 in whic is journaled avertically arranged hollow shaft 35 having its upper end projecting above the housing 3 and rigidly secured to a face plate 36. The upper end of the shaft 35 is (preferably prov 1 ed with screw threads an is adapted to 6 enter a screw-threaded boss 37 surrounding ihis projecting the pin 46 to enter the ho] the aperture 38 in the face plate 36 and forming a part of the face plate. A work form 39 is rigidly and removably sccurdl to the face plate 36. In the present instance, this formis shown. as a concave plate or howl adapted to receive concave-convex or flat disks and is provided with a central aperture 4-0 of greater diameter than the aperture 38 in the face plate 36.

in order that the work may be rapidly 'n'osecuted, it is desirable that means should be n'ovided whereby the work can be quickly secured to and removed from the work-support. To this end, we have provided a hollow plug or sleeve 4-], (see Figs. (3 and 7), having its lower end screw-threaded and adapted to engage the upper portion of the screw-threaded aperture 38 in the face plate 36, the screw-threaded end of the shaf t 35 terminatin some distance from the upper surlaceof the face plate. 'lheupper portion of the hollow plug 41 is split to form a plurality of resilient fingers 42, the upper ends of which are adapted to extend through the aperture in the center of the disk and are provided with shoulders 43 adapted to engage the edge of the disk surrounding the aperture. The upper part of the aperture within the hollow plug 41 flares outwardly, as is shown at 4.4, and is adaptedto receive the tapered head 4-5 of a pin 46 which extends through the hollow plug 41 and has its lower end screw-threaded and adapted to engage a screw-threaded socket 47 formed in the uper end of a rod 48 slidably mounted in the ollow shaft 35. Suitable means are provided for reciprocating this rod within the shaft and this means preferably consists of a collar 49 slidably mounted on the shaft 35 within the housing 2 and connected to the rod 48 by means of a pin 50 extending through a slot 51 formed in the hollow shaft 35. T'hc collar 49 is provided with an annular groove 52 adapted to receive pins 53 carried by a yoke 54 which extends about the collar 49 and is pivotally connected at 5!) to brackets 56 carricd by the inner wall of thehousing 3. The yoke 54 has an arm 57 extending outwardly through a slot 58 formed in the adjacent side wall of the housing 3 and has its outer end connected, by means of a link 59, to one end of a lever 60 which is )ivotally mounted on a bracket 61 carried by .the housing 3 and is provided with a handle 62 extending forwar ly within reach of the operator. 'lhus, it will be seen that \vh' n the lever 60 is moved downwardly about its pivotal center, the collar 49 and the rod 48,

to which it is, connected, will he moved downwardly,causing the ta )cred head 45 of low plug 41 and force the resilient fingers 42 outwardly and into firm engagement with the edges of the aperture in the disk, thus firmly locking the (llSk in position upon the work-form 39. 13.0

When it is desired to release the work, the upward movement of the handle 62 of the lever fillwill moyethe tapered head 45 of the pin 46 out of engagement with the resilient fingers 42 and permit the same to move out .of

engagement with the edges ofthe disk, thus releasing the disk and enabling the same to be removed. Suitable means, which form no part of the present invention and are nothere'shown, may be provided for retaining the handle 62 of the lever 60 in its upper and lower positions, respectively. ii-"hen it is desired to operate upon the convex side of the disk, the disk is placed upon the workform 39 in the manner shown in Fig. .7 and the hollow plug 41 and the pin 46 are provided of a greater length than those shown in Fig. 6. Otherwise, the construction and operation of the deviceare the same as that abovedescribed' In some types of disks the central aperture is so small as to render the use of the split accommodate the forms to t plug impractical and we have provided another form'of fastening means to secure that ty eof disk to the work-holder. As, shown in ig .8 and 9, this form of the device con- 'sists oI-a hollow plug 63 which is mounted in the screw-threaded aperture 38 of the face plate 39 and has a head 64 extending within the aperture 40 of the work-form 39. This head is provided with a series of pins 65' adapted to engage the pin holes 66 in the disk. A pin 67 extends through the hollow plug 63 and has its lower end screw-threaded mto'the screw-threaded socket 47 in the rod 48. This pin is provided at a point near the upper end of the hollow plug 63 with a ver-, tical slot 68 adapted to receive a key 69 having upwardly extending lugs 70 in theopposite ends thereof. This key is inserted in the slot 68 while the rod 48 and the in 67 are in their elevated position, nnd, w 1011 the rod and pin are moved downwardly, the. key 69 is clam ed firmly against the disk and the upward y extending lugs 70 prevent the same from working out of the slot in the pin. Still another common type of cultivator disk is'provided with a square aperture, and, to

us type of disk, We have substituted for the hollpw plug'63, in the form shown in Figs. 8 and 9, a plug 71 (Fig. 10) having a squared upper end 72' 8 adapted to fit in the square aperture of the disk. Inasmuch as there is little :or no tcndency on thepart. of thedisk to move vertically, all clam ing means are dispensed with in this form 0 fastening devicei The shaft 35 may be rotatedpiii any suitable manner, but we prefer to perate the same in the manner herein shown, in which the shaft is provided with a bevel gear 73 adapted to. mesh with a bevel pinion 7 4 secured to one end of a shaft 75, which is journaled in suitable bearings 76 and 77 and has its forward-end extending through the rear wall of the housing 3. A driving pulley 78 is loosely mounted on the shaftnear the bearing 77 and has connected thereto one member 79 of a clutch, the othermember, 80, of, which is slidably mounted on the shaft 75, but is held against rotation relatively thereto. The slidable member 80 of the clutch is provided with a grooved collar 81 adapted to receive pins 82 carried by the arms of a yoke 83 w iich is mounted on one end of a horizontal lever 84, the other end of which is pivotally mounted on the base 1, as

shown at 85.' The lever 84 is provided at a point between its pivotal center and the yoke 83 with an u wardly extending finger 86 having its face eveled, as shown at 87. This finger is preferably adjustably mounted on the lever 84 by means of a rearwardly extending portion 88 having a slot 89 formed therein and adapted to receive a bolt 90 which extends through the same and into the lever 84.

A rod 91 having its lower end beveled or tapered, as shown at 92, to engage the bevel 87 of the finger 86, is slidably mounted inthe spindle 6 of the yoke or vertically arranged member 5. This rod 91 is so connected to the wheel-supporting frame 16 that when that frame is moved downwardly, to bring the grinding member into engagement with the work, the lower end of the rod 91 will engage the beveled finger 86 and actuate the lever 84 to move the clutch member 80 into engagement with the clutch member 79 carried by the driving pulley 78,

thus causing the shaft 75 and the work-sup- 'jection or pin 97 carried by the yoke 15 forming a part of the supporting frame 16.

frame is raised and lowered, the rm 911 will be raised and lowered, the slotted connec- .Thus, it Wlll be seen that as the supporting movement of the pin 97 due to the movement of the yoke 15 about its pivotal center. A spring98 connectedat one end to the levcr 84 and attho other end to a fixed part of the base, such as a pin 99, serves to withdraw the slidable member 80 of the clutch from the (fixed member thereoffwhen the support 16.is elevated, and retain said slidab e member of. the clutch in its inoperative position until the supporting frame is again depressed. Itwill be apparent that the distion between the bar 92 and the yoke 15 be mg such as to permit of the longitudinal- 1 engagement with the work will depend upon fore .the grindin member has come into enand rearwardly therefrom.

ing machine in which both the work-support 5Q are supported upon the floor, the wheel-suptance the supporting frame will have to be i moved to bring the grinding member into the diameter of that member. Conseuently, the mechanism is so adjusted that t e clutch members will be moved into en gagement to rotate the work-support, be-i gagement with t 1e work, as shown in Fig. 1.

In order that the belt which drives the pulley 78 from the-overhead countershaft may not interfere with the belt which drives the shaft 11, we have provided an idle pulley 100 which is located above the pulley 7 8 in such a position as to engage the belt which drives the pulley 78 and hold the belt away from the belt which drives the shaft 11. The idle pulley 100 is preferably mounted on an arm 101 which is secured to the hearing 4 on the base 1 and extends upwardly The operation of the machine will be readily understood from the foregoing descrip tion and it will be observed that the only movement necessary on the part of the operator is to place the disk or other Work on the work-support and depress the handle 62 of the lever and then to grasp the handles 32 of the work-supporting frame and depress rhe grinding wheel upon the work, and, as soon as the operation is completed, to release the handles and permit the grinding wheel and its supporting frame to be elevated by means of the counterweight 31 and then to elevate the handle 62 and remove the disk from the work-support.

We have herein used the term grinding member or grinding wheel to indicate the member which operates u on the work and it will be understood that t 1688 terms, as used in the specification and claims, are used to indicate a grinding wheel, polishing or shar ening device or any similar device whic 1 it may be desirable to use in connection with the work being performed.

It will be observed from the above description of the construction and operatidn of this machine thatwe have provided a grind and the grinding wheel supporting frame porting frame being movable ina vertical operating plane to permit the same to be-moved into and out of contact with the work, being movable in a horizontal plane to permit the same to be moved laterally to engage different portions of the work and also being movable, to a limited extent, about a horizontal axis extending transversely to its axis of rotation to permit the surface of the wheel to be set at inclined surfaces of the work. 'It will also be apparent that we have provided an im-' proved work-support, which work-support is adapted to be rotated when the grinding wheel is in contact with the work thereon and that this rotation is controlled by suitable clutch members which are moved into and out of engagement with one another by the movement of the grinding wheel toward and away from the work. It will also be apparent that we have provided im roved means for fastening the work to a wor -support and that such means can be readily operated to permit the work to be quickly secured to or removed from the work-support. And further, it will be observed that the machine as a whole is of a very compact and simple con-- struction, there being no projecting arts near the work-support to interfere wit 1 the free movement of the operator, the (.ll'l\ ll mechanism for said work-sup ort being in cased within the housing 3, w ich forms the base for said work support, and the means for actuating said driving mechanism comprising a shaft which extends rearwardly through said housing and has the driving pulley secured thereto near the rear of the machine, thus entirely removing the pulley and its driving belt from the vicinity of the work-support, thereby removing all obstructions which would interfere in any manner with the movementsof the operator in operating the grinding mechanism or in placing the work upon the work-holder or rem oving the same therefrom. Further, it will be apparent that the machine as a whole is of a very strong and durable character and that the arts thereof are comparatively few in num er and of such a character that they will not be easily broken or disarrangcd, there being no parts requiring delicate adjustment and there being no complicated mechanism.

VVo wish it to be understood that we do not desire to be limited to the details of con struction shown and described, for obvious modifications will occur to a person skilled in the art.

Having thus fully described our invention, wh at we claim as new and desire to secure by Letters Patent, is z- 1. In a machine of the character described, the combination, with a base, and a worksupport, of a supportingrfral'no supported by said base and comprising a horizontal yoke 2. In a machine of the character described the combination, with a work-support, and a about a horizonta axis, av yoke carried by base providedwith a vertical bearing, of an said sup orting-frame, a grinding member journale in said yoke, and means for actuating said grinding member.

- 3. In a machine of the charae'terdescribed, the combination with a base, of a yoke rotatably mounted on 'sa'idbase to move about a vertical axis, ahorizontal supportingframe comprising two yokes and a connecting bar, one of said yokes being pivotally connected to the first mentioned yoke to move about a horizontal axis and the other yoke of said supporting frame being movable about an axis extending longitudinally to said supporting-frame, a grinding member journaled in the. arms of the last-mentioned yoke of said su porting-framd'and means for actuating sai grinding member.

4. In a machine of the character described,

the combination, with a work-support, and a' base provided with a bearing, of a vertically arranged yoke, a spindle carried by said yoke and mounted in. said bearing, a supportingframe comprising two oppositely arranged yokes and a connecting bar, the arms of one of said yok'es being pivotally connected to the arms of said u right yoke, a grinding member sup-ported )y the arms of the other yoke of said ,su porting-frame, and means for actuating sair grinding member.

5. In a device of-the character described, the combination, with a base having a worksupport mounted on one end thereof, and a bearing at the opposite end thereof, of a vertical member rotatably mounted in said hearing, a horizontal supporting frame pivotally connected to said vertical member, a grinding member carried by said supporting frame, and means for actuating said grinding member.

' 6. In amaehine of the character described, the combination, with a base having a bear ing at one end thereof, and-a work-support movably'mounted'at the other end thereof, of an upright member journalcd in said bear ing,a horizontalsupporting frame pivotally connected to said upright member and extemling longitudinally of said base, a grinding member carried by said horizontal member above said vmrk-support, and means for actuating said grinding member. 7

' 7. In a machine of the character described, the combination, with a rotatable work-support, and means for actuating the same, of a grinding member supported above said worksupport and movable in both a horizontal plane and a vertical plane, and means for actuating said grinding member.

8. In a machine of the character described, the combination, with a work-support comprising a vertically arranged shaft, a worksupporting member secured to said shaft, means for securing the work to saidmember, and means for rotating'said shaft, of a grind ing wheel mounted above said worlvsupport and capable of a free vertical movement toward and away from the same and afree horizontal movement relatively thereto, and means for actuating said grinding wheel.

, 9. In a machine of the character described, the combination, with a housing, a vertically arranged shaft journaled in said housing, a work-supporting member secured to the upper end of said shaft above said housing, means for securing the work to said member, a shaft extending through one side of said housin and operatively connected to said vertica shaft, and means for rotating said lastanentioned shaft, of a grinding wheel mounted above said housing and capable of a free vertical movement toward and away from the same, and means for actuating said grinding wheel.

10. In a machine of the character described, the eombination, with a housing, a vertically arranged shaft journaled therein, a Work-sup orting member secured to the upper end of said shaft, means for securing the work thereto, a shaft extending through one side of said housing and operatively connected to said vertically arranged shaft, a driving pulley loosely mounted ,on said last-mentioned shaft,'.and means for connecting said pulley to said shaft and disconnecting the same therefrom, of a grinding wheel supported above said work-supporting member and capable of movement toward and away from the same. v

11. In a machine of the character described, the combination, with a movable work-support, means for actuating the same, 100 anda grinding member supported above said work-support and movable toward and away from the same, of automatic means for controlling the actuating mechanism for said work-support.

12. In a machine of the character described, [the combination, with a movable work-support, means for actuating the same, and a grinding member supported above said worlcsuppoit and movable toward and away 0 from the same, of means actuated by the movement of said grinding member toward and away from said work-support for controlling the actuating means for said worksupport. 115

13. In a machine of the character described, the combination, with-a rotatable worlcsupport, and a grinding wheel su' )ported above said work-support and move le toward and away from the same, of a shaft op- 120 eratively connected to said work-support, a driving member, and means controlled by the movement of said grinding Wheel toward said work-support for operatively connecting said driving member with said shaft.

14. In a machine of the character described, the combination, with a rotatable 'work-su port, and a grinding member mountei above said work-support and mo,v

able toward and away from the same, of a 0 shaft operatively connected to said work support, a driving member loosely mounted on said shaft, a clutch member connected with said driving member, a second clutch member slidably mounted on said shaft and held against rotation thereon, means for holding said second clutch member normally out of engagement with said first-mentioned clutch member, and means actuated by the movement of said grinding wheel toward said work-support for moving said slidable'mernher into engagement with said first-mentioned clutch member.

15. In a machine of the character -lescribed, the combination, with a rotatable work sup wort, and a grinding member mounted a ove said work-support and movable toward and away from the same, of a shaft operatively connected to said worksupport, a driving member loosely mounted on said shaft, a clutch member connected with said driving member, a second clutch member slidably mounted on said shaftand held against rotation. thereon, means for holding said second clutch member normally out of engagement with said first-mentioned clutch member, a lever pivotally mounted near said shaft and having oneend operatively connected to said slidable clutch memher, and means actuated by the movement of said grinding member toward said worksupport for actuating said lever to move said slidable clutch member into engagement with said firstmentioned clutch member. 16. In a machine of the character de scribed, the combination, with a rotatable work support, and' a grinding member mounted above said work-support and movable toward and away from the same, of a 40 shaft operatively connected to said worksupport. a driving member loosely mounted on said shaft, a clutch member connected with said driving member, a second clutch 'memberslidably mounted on said shaft and held against rotation thereon, means for holding said second clutch member normally .out of engagement with said first-mentioned clutch member, a lever pivotally mounted on said shaft having oneend operatively con nected to said slidable clutch member, a rod slidably supported near said lever and operatively connected to said grinding member, 7 and a part carried by said lever and adapted to be engaged by said-rod to actuate said lever and move said slidable clutch member intc engagement with said first-mentioned ch tch member when said grinding member is moved toward said work-support.

17 In a machine of the character described, the combination, with a rotatable work sup 01 t, and a grinding member mounted a 'ove said work-support and m0vable toward and away from the same, of a shaft operatively connected to said worksupport, a driving member loosely mounted on said shaft, a clutch member connected. with said driving member, a second clutch memberslidably mounted on said shaft and held against rotal ion thereon, means for holding said second clutch member normally 7 out of engagement with said first-mentioned clutch member, a lever pivotally mounted on said shaft having one end operatively connected to said slidable clutch member, a rod slidably supported near said lever and opera tively connected to said grinding member, and a finger adjustably mounted on said le ver and having its end beveled and adapted to be engaged by said rod to actuatesaid lever to move said slidable clutch memberintiflgo engagement with said first-mentioned clutch member when said grinding member is moved toward said work-support.

18. In a machine of the character described, the combination, with a rotatable g work-support, a supporting-frame movably mounted near said work-support, and a grinding member carried by said supportingframe and movable toward and away from said work-support, of a shaft operatively connected to said rotatable work-support, a driving member loosely mounted on said shaft,a clutch member connected with said driving member, a second clutch member slidably mounted on said driving shaft and 9. held ag tinst rotation thereon, a lever pivotally mounted near said shaft and operatively connected to'said slidable clutch member, means for retaining said slidable clutch mom-- ber normally out of engagement with said first-mentioned clutch memb'er, a vertically arranged rod slidably supported near said lever, a bar having one end rigidly secured to said rod and its other end connected to said supportingframe, whereby said rod is caused to move in unison with said supporting-frame, and a part carried by said'lever and adapted to be engaged by said rod to actuate said lever to move the slid'able clutch member into engagement with said first-mentioned clutch member when said grinding member is moved toward said \vork-sinmort. 19. In a machine of the character described, the combination,with a rotatable work-support, a base having a bearing, a vertically arranged member having a hollow spindle mounted in said bearing, a horizontal su ')porting-frame pivotally connected to said vertical member, and a grinding member carried by said supporting frame and movc able toward and away from said worksupport, of a shaft operatively connected to said work-support, a driving member loosely mounted on said shaft, a clutch member connected therewith, a second clutch member slidably mounted on said shaft and held against rotation thereon, a lGVGPPlVOtlIllY mounted on said shaft and connected with said slidable clutch member, a spring connected to said lever and adapted to hold said slidable clutch member normally out of engagement with said first-mentioned clutch member, a rod slidably mounted in said hollow spindle, a bar having one end connected to said rod and llJSOtllGI end slidably connected to said supporting frame, whereby said rod is causedto move in unison with said supporting frame, and a finger carried by said lever and having its face beveled and adapted to be engaged by said rod when said supporting-frame is actuated to move said grinding member toward said work-support.

20. A- work-support comprising a 'work supporting-member, means for clamping the work to said work supporting-member, and actuating devices supported beneath said work supporting-member and operatively' connected to said clamping means.

21. A work-support comprising a work supporting-member, means for clamping the work to said work supporting-member, a

hollow support for said work supporting member, and actuating devices mounted in said hollow support and operatively connected to said clamping means.

22. A work-support com rising a worksupporting member, means or clamping the work to said work-s11 porting mem er, and a reeiprocat-ory memlier foractuating said clamping means.

23. A work-support comprising a face .plate, a work-supporting form secured to said face plate, means for clampingthe work to said work-sup orting form, and a reciprocatory member or actuating said clamping means.

24. In a work-support, the combination, with a rotary work-supporting member having a central opening, of a reciprocatory member extendmg through said 0 ening, and means adapted to be actuated v said reciprocating member for securing the work to said work-su porting member.

25. Ina wor -support, thecombination, with a rotary work-supporting member having a central opening, and means mounted in said'opening for securing the work tosaid work-supporting member, of'a reciprocatory member for actuating said securing; means.

26. In a machine of the character described, a work-support comprising a hollow shaft, a work-s11 )portin'g member secured to one end of said shaft, a rod slidably mounted in said hollow shaft, means actuated by said rod for securing the work to said work-s11 pporting member, means 1 for actuating said rod, and means for rotating said shaft.

27. In a machine of the character described, a work-support comprising a hollow shaft, a work-su porting member secured to one endof said shaft, a rod slidably mounted in said hollow shaft,-means connected to said M rod for securing the work to said work-supshaft having a slot therein, a work-so means connected to said lever and extending through said slot for actuating 'sald rod, and

means for rotating said shaft.

' 29. In a machine of the character described, a'work-sup ort comprising a housing, bearings carriecFbysaid housing, a h'ollow shaft ournale'd in said bearings and having a slot therein, a work-supporting member carried by said shaft, a rod slidably mounted in said shaft, means connected to'said rod for securing the work to said work-supporting member, a collar slidably mounted on said shaft, means extending through said slot for connecting said rod to said collar, a yoke connected to said collar and pivotally mounted on said housing, an arm carried by said yoke, a lever pivotally mounted on said housing and connected to the outer end of said arm, and means for rotating said shaft.

30. In a machine of the character described, a work-su )port comprising a vertically arranged holfow member, a work-supporting member mounted 'on the upper end of said hollow member, a rod slidably mounted in said hollow member, means connected with said rod for securing the work to said work-supporting member, and means connected to said rod, for actuating-the same.

31. In-a machine of the character described, .a work-support comprising a work'- supporting member, a reciprocablc rod extendingabove said work-supporting member, a plug carried by said rod and adaptedv to engage the work on said work-supporting,

,mcmber, and means for actuating said rod.

32. In a machine of 'thezcharacter described, a hollow shaft, a'workasup orting member secured to one end .of said s raft, a' rod slidably mounted in said hollow shaft, a part carried by said rod extending abovesaid work-supporting member and adapted to secure the work thereon, and means for actuating said rod. 1

33.111 a machine of the character described, the combination, -with a hollow shaft, a rod slidably mounted therein, a work-su porting member secured to one end fiaft, a hollow plug secured to the end of said shaft, a pin secured to said rod extending through said hollow plug and adapted to cooperate therewith to secure the work to saidwork-sup orting member, and means for actuating saiil rod.

34. In a machine of the character described, the combination, with a hollow shaft having a rod slidably mounted therein, a work-supporting member secured to one end of said shaft, an expansible plug extending-through said Work-supporting member, a pin connected to said slidable rod and tending through said expansible plug and having an enlarged portion adapted to expand saidplug, and means for actuating said slidable rod.

35. In a machine of the character described, a Work-support comprising a hollow shaft, a rod 'slidably' mounted therein, a-

work-supporting form mounted on one end .of said shaft, a hollow plug extending through said work-supporting form, connectedwith said shaft and having its outer end split to form resilient fingers, a pin secured to said slidable rod and havin an enlarged portion adapted to engage t e split cm of said'plug to expand t e same, and means for actuating said slidablc rod.

36. In a machine of the character described, a Work-support comprisin a vertically arranged hol ow shaft, a 1'0 slidably mounted therein, a face plate secured to the upper end of said shaft, a work-sup orting form secured to said face plate and iaving .an aperture therein, a hollow plug extending through the aperture in said work-support ing form andv secured to said face plate, having its u per end split and adapted to engage the Wor on said work-sugporting form, a pin connected to said slidab e ro'd, extending through said hollow plug and having an enlarged portion adapted to engage the upper portion thereof to expand the same, and means for actuating said slidable rod.

37. In a machine of the character described, a work-sup ort' comprising a hollow shaft, a red slidab y mounted therein and having a screw-threaded socket in the upper end thereof, a face plate secured to the upper end of said shaft. and having'a screw-threaded aperture therein, a work-supporting form secured to said face plate and having an ap-v erture therein, a plug extending through the aperture in said work-supporting form and having one end screw-threaded to engage the screw-threaded aperture in said face plate and having its upper end split to form a series of resilient fingers adapted to engage the ,work, said plug being provided with a "central. opening having its upper end flared erturein said plug and having its lower end i outwardly, a pin extending tirough the apthe work to said work-supporting member, means for actuating said rod, and a shaft operatively connected to said hollow shaft, of a vertically movable supporting-frame supported on said base, a grinding member carried by said supporting frame and movable toward and away from said'worlesupporting member, and means controlled by the'movement of said grinding member toward and away from said \w'ork-supporting member for actuating said shaft.

39. In a machine of the character de scribed, the combination, with a base having a housing at one end thereof, a vertically arranged hollow shaft journale'd in said housing, a work-supporting member secured to the upper end of said shaft, a rod slidably mounted in said hollow shaft, means connected to said rod for securing the work to said work-supporting member,

means for actuating said rod,'and a shaft 0 eratively connected to said hollow shaft, 0 a vertical member pivotally mounted, on said base, a horizontal supporting-frame piv-. otall connected to said vertical member, a grin ing membercarried by said supportingrame and movable toward and away from said Worlesupporting member, a counterweight connected to said "supporting-frame and adapted to retain the same normally in its elevated position, and means controlled by the movement of said supporting-frame for actuating said shaft.

In testimony whereof, we affix our signatures in presence of two witnesses.

BENJAMIN ll. DAVIS. Y CALVIN B. ROSS.

\Vitncsses Eliza F. MGKEE, EDWARD L. REED.

means connected to said rod for securing 

